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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cfe1ebd7f6e006e1f1f5bb9748890b3df1742b3a0fe3fa241c55186c3d4a33d' 
  AND token = 'RISOYm1dSsqMCHZbX1PkkIcImhK4S/wuOhIzcboDTwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}